ElectrifiedExperts
EcoFlow Delta Pro 3 vs Anker SOLIX F3800 splits cleanly once you stop reading the spec columns side by side. The F3800 wins on raw output and outlets: 6,000 W continuous, 9,000 W surge, and a NEMA 14-50 that runs a real Level 2 EVSE. The Delta Pro 3 wins on everything you can verify: 93% measured usable capacity, the best result in the only independent bench test of this category, plus a cycle rating with an actual endpoint attached and published temperature limits. Anker gives you neither of those.
Pick by the job you are buying it for. Below is a scenario-by-scenario verdict, and the three places where the datasheets diverge in ways nobody writes about.
The short version
- Whole-home backup: F3800. 6,000 W continuous against 4,000 W is a different class of load budget, and the 14-50 plus L14-30 pair covers more transfer arrangements.
- Well pump: F3800. 9,000 W surge and 6,000 W continuous. Neither unit’s boost mode counts, and that matters more than the surge figure.
- EV charging: F3800, for one reason. The NEMA 14-50 drives a standard Level 2 EVSE with no adapter and no derating games.
- Off-grid solar: Delta Pro 3. Two genuinely independent MPPT trackers, one of them running to 150 V, which changes how you wire an array.
- Cold weather: Delta Pro 3, because it publishes its limits. Anker does not publish an operating temperature range for the F3800 at all.
- Anker’s “3000+ cycles” has no stated capacity endpoint. EcoFlow says 4,000 cycles to 80%. Those are not comparable numbers and one of them is unfalsifiable.
- Neither is portable. 113 lb and 132 lb. This is appliance shopping.
The numbers, with the endpoints attached
| Spec | EcoFlow Delta Pro 3 | Anker SOLIX F3800 / F3800 Plus |
|---|---|---|
| Rated capacity | 4,096 Wh | 3,840 Wh |
| Measured at the AC outlet | 3,790 Wh, 93% of rating (OutdoorGearLab) | Not independently bench-tested that we could find |
| Continuous output | 4,000 W | 6,000 W |
| Surge | 8,000 W | 9,000 W |
| Boost mode | X-Boost 6,000 W (resistive loads only) | Not offered |
| 240 V outlets | L14-30R 120/240 V, plus NEMA 6-20R 240 V 20 A | NEMA 14-50 and NEMA L14-30, both rated 6,000 W |
| 120 V outlets | 4× NEMA 5-20R 20 A, 1× TT-30R 30 A | 6× NEMA 5-20 20 A |
| Cycle life | 4,000 cycles to 80% | “3000+ cycles”, no capacity endpoint stated |
| Solar input | 2,600 W across two independent trackers: 30–150 V ⋮ 15 A / 1,600 W and 11–60 V ⋮ 20 A / 1,000 W | 2,400 W as 2×1,200 W, both 11–60 V ⋮ 25 A. Plus raises the total to 3,200 W |
| AC input | 100–240 V at 15 A | 1,800 W maximum |
| Transfer time | 10 ms | under 20 ms |
| Max expansion | 48 kWh | 53.8 kWh (6× BP3800) |
| Ingress rating | IP65 | Not published |
| Operating temperature | Charge 0 to 45 °C, discharge −10 to 45 °C | Not published |
| Noise | As low as 30 dB | Not published |
| Weight | 113.5 lb | 132.3 lb (dimensions quoted including wheels) |
| Warranty | 5 years | 5 years |
All figures from the manufacturers’ own US specification pages, plus OutdoorGearLab bench data for measured capacity. Where a field says not published, we checked and it is genuinely absent, not omitted here for space.
The cycle rating is the biggest gap, and it is an information gap
EcoFlow says 4,000 cycles to 80% of original capacity. Anker says “3000+ cycles” and stops. No endpoint. A lithium iron phosphate cell hitting 70% capacity takes substantially more cycling than the same cell hitting 80%, so a rating without an endpoint is not a specification, it is a marketing number. It is also unfalsifiable in the direction that helps Anker: any result above 3,000 confirms it.
This is not nitpicking. Across the wider category the endpoints are all over the place. Jackery rates to 70%. EcoFlow rates to 80%. DJI rates the Power 1000 to 70% and the Power 2000 to 80% inside one product family. Every comparison chart on the internet stacks these in a single column as if they mean the same thing. On a unit you expect to keep for a decade and expand with more batteries, the endpoint is the number that decides lifetime energy, and Anker withheld it.
Measured capacity: the Delta Pro 3 is the best result in the field
Rated watt-hours are not the watt-hours you get. Inverter conversion, the BMS low-voltage reserve, and nominal-versus-actual pack voltage all take a cut before anything reaches an outlet, and no manufacturer discloses the total.
3,790 Wh delivered from a 4,096 Wh rating. That 93% is the top of a field where the spread runs from 68% to 93%, and it means the Delta Pro 3’s real-world energy advantage over the F3800 is larger than the 256 Wh gap in the rated numbers suggests. If the F3800 lands at a category-typical 85%, it delivers around 3.26 kWh against the Delta Pro 3’s measured 3.79, a gap of roughly 16%.
That 85% is an inference, not a measurement, and I am flagging it as one. Nobody has bench tested the F3800 publicly. What is fair to say is that EcoFlow’s number is verified and Anker’s is not.
Whole-home backup: F3800, unless your loads are small
6,000 W continuous against 4,000 W is the headline, and it is real. The difference is a microwave and a well pump running at the same time versus choosing between them. Anker also sells the F3800 Plus with a Home Power Panel and a transfer switch kit bundle on Amazon, which is the route to actually backing up circuits instead of running cords under a door.
The Delta Pro 3 answers with 10 ms transfer against under 20 ms, and with IP65, which is a genuine advantage if the unit lives in a garage that gets wet or a shed that gets dusty. Both are offline topology, so both drop out briefly. Neither is a true online UPS. If your critical load is a desktop or a fridge, both are fine. If it is a rack, look at the Delta Pro Ultra instead, which is the only unit in this family with double-conversion 0 ms switchover.
One correction worth making because the affiliate sites get it wrong constantly: EcoFlow’s X-Boost 6,000 W does not belong in your load budget. X-Boost works by dropping output voltage so a resistive load draws its rated current at lower power. Feed an induction motor a lower voltage and it draws more current, heats up, and risks stalling. For a heater or a kettle it is a real feature. For a compressor it is a way to damage windings. The Delta Pro 3 is a 4,000 W machine when a motor is involved.
Well pump: F3800, and check the outlet before the surge number
A half-horsepower submersible runs at roughly 1,000 W and starts at 2,000 to 3,500 W. Three quarter horse runs around 1,500 W and can hit 5,000 W starting. Most are 240 V. Both units can do this on paper, and the F3800 has more room: 9,000 W surge on top of 6,000 W continuous, against 8,000 W on top of 4,000 W.
The outlet matters as much as the inverter. The F3800’s L14-30 and 14-50 are both rated to the full 6,000 W. On the Delta Pro 3 the L14-30R is your 240 V workhorse; the NEMA 6-20R is 240 V but only 20 A, so it is a tool outlet, not a pump feed. Size around the L14-30R and the pump’s locked-rotor current, not around the marketing surge figure.
EV charging: F3800, on the strength of one receptacle
Both units will charge an EV, and neither will charge it much. Energy is the constraint. A power station holds 3 to 4 kWh and an EV pack holds 60 to 130.
Roughly 11 miles each, per full discharge, for a sedan at 3.5 mi/kWh. Six for a truck. What separates them is how you deliver it. The F3800’s NEMA 14-50 accepts a standard Level 2 EVSE directly, which is both faster and less lossy than the Level 1 cordset a 120 V outlet forces you into. The Delta Pro 3’s L14-30R can also feed a Level 2 unit, but you are into adapter and current-setting territory to get there.
Where either becomes genuinely useful is stacked and fed by solar. A four to six battery F3800 stack is 15 to 25 kWh, which is 50 to 75 miles, and an array harvesting 8 to 10 kWh a day into it is roughly 25 to 30 miles of free range daily, indefinitely. One-shot transfer is futile. Daily harvest is not.
Off-grid solar: Delta Pro 3, and the reason is the voltage window
The watt totals look close. 2,600 W on the Delta Pro 3, 2,400 W on the base F3800, 3,200 W on the F3800 Plus. The interesting difference is what voltage each will accept.
The Delta Pro 3 runs two independent trackers with different windows: a high-voltage input at 30 to 150 V and 15 A, and a low-voltage input at 11 to 60 V and 20 A. The F3800 gives you two 1,200 W inputs both limited to 11 to 60 V at 25 A. That 150 V ceiling is the whole story. It lets you put four or more panels in series, which means lower current for the same power, which means thinner wire and less loss over a long run to a ground mount. Stuck at 60 V you are forced into parallel strings and fat copper.
Two independent trackers with different windows also means you can point one array east and one west without the weaker string dragging the stronger one down. If your roof has two orientations, this is the unit.
The Delta Pro 3 also takes 100 to 240 V on its AC input at 15 A, so it will recharge from a 240 V outlet at roughly double the F3800’s 1,800 W ceiling. For anyone cycling a unit hard between outages or generator runs, that is a bigger practical difference than the solar numbers.
Cold weather: Delta Pro 3, because Anker won’t say
EcoFlow publishes it plainly. Charge 0 to 45 °C, discharge −10 to 45 °C, storage 20 to 30 °C. Anker publishes no operating temperature range for the F3800. Not a charge window, not a discharge window, nothing.
Assume the F3800 shares the same 0 °C charge cutoff, because essentially every LFP unit in this category does. That limit is the single most common false fault report in the whole product class: it is a freezing morning, the panel is producing, the BMS refuses the charge, and the owner concludes the unit is broken. It is not broken. But a manufacturer that will not tell you where the wall is has made your winter planning harder, and on a purchase of this size that is a fair thing to hold against it.
Portability: neither, but the Delta Pro 3 is 19 lb lighter
113.5 lb versus 132.3 lb. Both have to be wheeled, and Anker’s published dimensions include the wheels, which tells you how the thing is meant to move. Neither goes camping in any meaningful sense, neither gets carried up stairs by one person, and both are best thought of as appliances that occasionally relocate. The Delta Pro 3’s IP65 rating is the more useful real-world difference here, because it means a wet driveway is not a problem.
Where each one wins
- Delta Pro 3: 93% measured usable capacity, the best independently verified result in the category
- Delta Pro 3: cycle life with a stated 80% endpoint, so the number means something
- Delta Pro 3: two independent MPPT trackers, one accepting up to 150 V
- Delta Pro 3: IP65, 10 ms transfer, published temperature and noise figures
- F3800: 6,000 W continuous and 9,000 W surge, a genuinely larger load budget
- F3800: NEMA 14-50 and L14-30 both rated to full output, the best outlet set here
- F3800: 53.8 kWh maximum expansion and a Home Power Panel path to circuit-level backup
Where each one costs you
- Delta Pro 3: 4,000 W continuous is the lower ceiling, and X-Boost cannot fill the gap on motors
- Delta Pro 3: the NEMA 6-20R is 240 V but only 20 A, easy to mistake for a second pump outlet
- F3800: “3000+ cycles” with no capacity endpoint, which is not a usable specification
- F3800: no published temperature range, ingress rating, noise figure or MPPT tracker count
- F3800: no independent capacity measurement exists, so you are trusting the rating
- F3800: 1,800 W AC input ceiling, half what the Delta Pro 3 will take from a 240 V supply
- Both: 113 to 132 lb, offline UPS topology, and a 0 °C charging wall
One open item before anyone commits to a large Anker stack. There is a thread on the DIY Solar Power Forum, number 110485, describing a significant problem with F3800 Plus expansion batteries in a large installation. We have not read it in full and it is one owner’s account, so treat it as an unverified lead rather than a defect claim. It is worth reading before you buy five BP3800 packs.
What to buy
EcoFlow DELTA Pro 3 Portable Power Station
The 4,096 Wh unit with the L14-30R and 6-20R 240 V outlets, 4,000 W continuous, 8,000 W surge, 4,000 cycles to 80%, IP65, and 2,600 W of solar across two independent trackers. This is the pick for solar-first installs and for anyone who wants specifications they can verify. Confirm the Amazon listing header reads “DELTA Pro 3” and 4096 Wh before ordering. EcoFlow runs several near-identical Delta-family listings at once and rotates bundle ASINs constantly, and the naming is genuinely a mess. Check the current price on Amazon.
Check price on Amazon(paid link)
Anker SOLIX F3800 Plus
3,840 Wh, 6,000 W continuous, 9,000 W surge, NEMA 14-50 and L14-30 both at full output, expandable to 53.8 kWh, and 3,200 W of solar input on the Plus revision against the original’s 2,400 W. The pick for heavy loads, a well pump, or EV charging at Level 2. Go in knowing the cycle rating has no stated endpoint and the temperature range is unpublished. Check the current price on Amazon.
Check price on Amazon(paid link)
If you want the F3800 with a panel to start from, the F3800 bundled with a 400 W panel on Amazon is the common starting configuration, though one 400 W panel is a starter rather than a system. And if reading the weights above has changed your mind about the whole category, the EcoFlow Delta 3 Plus at 1,024 Wh or the Anker SOLIX C1000 at 1,056 Wh cover a fridge and lights through an outage for a fraction of the mass. Both are sold on Amazon.
Frequently asked questions
Which is better overall, the Delta Pro 3 or the F3800?
Neither, and that is a real answer rather than a dodge. The F3800 has 50% more continuous output and the better outlet set. The Delta Pro 3 has verified capacity, a cycle rating with an endpoint, published temperature limits and a far better solar input design. Pick by whether your constraint is watts or watt-hours.
Can either one run a well pump?
Both can on paper. The F3800 has more margin at 6,000 W continuous and 9,000 W surge, and its L14-30 is rated to full output. Size around the pump’s locked-rotor current, use the 240 V outlet, and do not count EcoFlow’s X-Boost toward the surge budget because it works by reducing voltage and that is wrong for a motor.
Which charges an EV faster?
The F3800, because its NEMA 14-50 feeds a standard Level 2 EVSE without adapters. Both hold only about 11 miles of range for a sedan per full discharge, so the meaningful question is not speed but whether you plan to stack batteries and add solar.
Is the F3800's "3000+ cycles" rating comparable to EcoFlow's 4,000?
No. EcoFlow states 4,000 cycles down to 80% of original capacity. Anker states no endpoint at all, so there is nothing to compare against. Reaching 70% takes considerably more cycling than reaching 80%, which means an unlabelled rating can be made to look better or worse at will.
Can I use either one below freezing?
You can discharge both in the cold. Charging is the problem: the Delta Pro 3 stops accepting charge below 0 °C, and the F3800 almost certainly does the same, though Anker does not publish a range. Plan for a solar array that produces nothing into the battery on a freezing morning until the pack warms up.
Where to go next
Each unit gets a full teardown of its own in the EcoFlow Delta Pro 3 spec analysis and the Anker SOLIX F3800 spec analysis. If you are still working out how big a unit you need, the portable power station guide covers the three specs that decide it, and Jackery vs EcoFlow vs Anker splits the brands by buyer. The arithmetic behind the range numbers above is worked out in full in charging an EV from a power station.
